Material No.: alloy 20

DescriptionChemical
composition		Physical
mechanical
properties		Temparature
information		StandardsProcess
information		Application
Certification		ProductsAll

Description

EN symbol (short)NiCr20CuMo
Material No.2.4660
UNSN 08020
Registered work's labelNicrofer® 3620
Density kg/dm38,1
Hardness HBW<=220
CompositionNickel Iron Chrome alloy
Niob stabilized
CategoryHeat resistant steels and alloys
Corrosion resisting steels and alloys
Structureaustenitic
Description2.4660 is a columbium stabilised, low carbonised nickel iron chrome alloy with molybdenum and copper addition. It is highly resistant to corrosion and shows good resistance to sulfuric/phosphoric/nitric acids in chloride containing media.

Chemical Composition

 CSiMnPSCrMoNiCuColumbiumCoNb+TaFe
alloy 20Min %     19,002,0032,003,008xC   
Max %0,071,002,000,0450,03521,003,0038,004,001,00   
2.4660Min %     19,002,0032,003,00  8 x Cbalance
Max %0,071,002,000,0250,01521,003,0038,004,00 1,501,0balance
(Key to Steel 2010)
N 08020Min %     19,002,0032,003,008xC   
Max %0,071,002,000,0450,03521,003,0038,004,001,00   
ASTM B 464

Physical properties

PropertyValue
Density: kg/dm38,1
Hardness: HBW<=220
Permeability at 20°C/68°Fmax.1,002
Temperature T
°C/F
(°C/F)		Specific heat
J / kgK
(Btu / lb °F)		Thermal conductivity
W/mK
(Btu·in / ft2·h·°F)		Electric resistance
µΩ · cm
(Ω circ mill / ft)		Modulus of elasticity
kN/mm2
(103 ksi)		Expansion rate from 70°F bis T
10-6 / K
(10-6 / °F)
2045611,5107202 
200476124,811319215,6
40049218,211917916,0
60050821,512316416,7

Mechanical properties (20°C / 68°F)

Yield strength Rp 0,2 -20°C/68°F ( N/mm2)240
Yield strength Rp1,0-20°C (N/mm2)280
Tensile strength Rm-20°C/68°F (N/mm2)550
Elongation A5-20°C/68°F (%)30
Remarks 

Temparature information

Application area
Operation temperature ºF  to 932 ºF 
Stability heat treatment
Working temperature1688 ºF  to 1760 ºF 
Explanation reportpreferably at 1700°F
Solution heat treatment
Working temperature2102 ºF  to 1652 ºF 
Explanation reportfast cooling by air/water

Standards / information

StandardsDesciption
ASTM B 463Standard Specification for UNS N08020 Alloy Plate,Sheet,and Strip
ASTM B 464Standard Specification for Welded UNS N08020. Alloy pipe
ASTM B 468Standard Specification for Welded UNS N 08020 Alloy Tubes
ASTM B 729Standard Specification for Seamless Nickel-Alloy Pipe and Tube
DIN 17744 (2002/09)nickel-forgeable alloy with molybdenum and chrome
DIN 17750 (2002/09)ribbons and sheet metal out of nickel with nickel-wrought alloy properties

Process information

Cold formingcaution: higher tendency to cold-work hardening than austenitic non-corroding steel
>15% anew stability annealing required
Chip removing processpreferably in annealed state, mind cold-work hardening
Welding
 - TypeWIG
plasma welding
MIG/MAG
manual electric welding
 - Add. materialWIG/MIG 2.4831, 2.4607 ; rod electrodes 2.3621, 1.4609

Main fields of application

Details of applicationvery good resistance to sulfuric and phosphoric acid, nitiric acid
Certifications
Chemical IndustrySchwefelsäure,
pharmaceutical industry
KunststoffindustrieHerstellung synthetischer Kunststoffe
food processing industry

Range of products

Product typeProduct
Plates / Sheetsplates/sheets
plate/sheet cuts
Rotating componentsfittings from barsteel
Fittingswelded elbows
welded reductions
Welded T-pieces
seamless elbows
seamless T-pieces
Flanges / Collars / Flared tube endsflared tube end
collars
various flanges (weld neck flange,blind flange etc.)
Pipes / Tubeswelded pipes/tubes
welded square pipes/tubes
seamless pipes/tubes
Bar steelflat steel
section steel
round bar steel
hexagon steel

Liability exclusion

All aforementioned specifications serve as a general orientation and have to be reviewed depending on the conditions of use.
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